While returning to the Nobuna Gaizers show to have the actors sign his collection album, Mitsuhiko disappears without a trace right after entering the props tent. His whereabouts are unknown because his cellphone and detective badge were left behind by the culprits.

Robbery

Location:

Gifu City History Museum

Suspects:

The Nobuna Gaizers actors

The museum is raided and several historical gold artefacts connected to Oda Nobunaga are stolen, including a gold miniature statue of the daimyo, and several valuable manuscripts. The security camera footage depicts the Nobuna Gaizers show actors, in full costume, as the apparent offenders. However, by observing several details, Conan swiftly concludes that this was the work of impostors who have masqueraded themselves as the Gaizers.

Kimifusa Oyabu is revealed to be the mastermind behind the museum robbery. He was disguised as Nobuna Gaizer Red during the robbery, but was exposed by his righthandedness, whereas Akahoshi is lefthanded, and because of the ring on his right hand, which he failed to take off before the raid. Upon being confronted by the Detective Boys and the police, Oyabu breaks down and confesses that his company is failing and in heavy debt with a loan company, whose thugs masqueraded as the other Gaizers.